TAP-114: Trouble Clearing 363-206-285
Page 3 of 6 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
19. Does voltage measure between –42 and –58 volts?
If YES, then proceed to Step 37.
If NO, then continue with Step 20.
20. Is 197A BATTERY LOAD TEST SET available for use in testing batteries?
If YES, then continue with Step 21.
If NO, then proceed to Step 23.
21. Test batteries using 197A test set.
Reference: DLP-536
22. Replace any failed battery pack(s) and reconnect battery leads to battery shelf
and proceed to Step 24.
23. Replace battery packs one at a time until –48 volts is present at output jacks
on battery shelf.
24. Does alarm clear?
If YES, then STOP. YOU HAVE COMPLETED THIS PROCEDURE.
If NO, then continue with Step 25.
25. Is FAN ALARM LED lighted on a fan assembly?
If YES, then continue with Step 26.
If NO, then proceed to Step 37.
26. Remove FAN H and FAN L fuses on corresponding BFU on power shelf. Are
fuses blown?
If YES, then continue with Step 27.
If NO, then proceed to Step 30.
27. Replace FAN H and FAN L fuses on corresponding BFU.
28. Does alarm clear?
If YES, then STOP. YOU HAVE COMPLETED THIS PROCEDURE.
If NO, then continue with Step 29.
DLP-536
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